title: Validation of accumulation models for inorganic suspended solids of different particle size in an activated sludge system.
abstract: In this study the effect of different particle sizes of inorganic suspended solids (ISS) on the ISS accumulation in an activated sludge system was investigated. The volume mean particle diameters (Dv) of ISS were 26, 73, 106, 165, and 210 μm. There are four fates of ISS in an activated sludge system: (1) suspending in the activated sludge, (2) depositing at the bottom of the reactors, (3) discharged from the reactors via excess sludge, and lastly (4) discharged from the reactors via effluent. The accumulated ISS in the bioreactor was unevenly distributed. Based on the accumulation proportion of ISS in bioreactor, an ISS accumulation model was established, from which the ISS accumulation concentration and the MLVSS/MLSS could be predicted. The proportion of ISS suspending in activated sludge was 0.22, 0.21, 0.042 and 0.031. The proportion of ISS depositing at the bottom of bioreactors was 0.31, 0.47, 0.75, 0.76 and 0.92.
authors.affiliation: Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China. Electronic address: helitougao@163.com.
authors.forename: Li
authors.initials: L
authors.lastname: He
authors.forename: Fang-ying
authors.initials: FY
authors.lastname: Ji
authors.forename: Xiao-ling
authors.initials: XL
authors.lastname: He
authors.forename: Wei-wei
authors.initials: WW
authors.lastname: Zhou
authors.forename: Xuan
authors.initials: X
authors.lastname: Xu
authors.forename: Ming-sheng
authors.initials: MS
authors.lastname: Lai
mesh_terms: D019149:Bioreactors; D007287:Inorganic Chemicals / Q000032:analysis* / Q000737:chemistry*; D008962:Models, Theoretical; D010316:Particle Size; D015203:Reproducibility of Results; D012722:Sewage / Q000737:chemistry*; D014835:Volatilization; D014865:Waste Disposal, Fluid
chemical_list: D007287:Inorganic Chemicals; D012722:Sewage
keywords: Accumulation model; Activated sludge; Inorganic solids; MLVSS/MLSS; Particle size